Texas remains the leader nationwide of hot-car deaths, according to San Francisco University’s Department of Earth and Climate Science, which led local police to offer a demonstration highlighting hot-car dangers. And as the tragedies pile up, many speculate why automakers haven't solidified a solution.

1: Hot vehicles are the primary non-crash, vehicle-related killer of children under 14, according to the National Highway Traffic Safety Administration. Children under the age of 1 are the most common victims, according to Kidsandcars.org.

16: Only a few weeks into summer, this year’s count of 16 hot-car deaths is currently the lowest in recent history, according to the Department of Earth and Climate Science at San Francisco State University. Twelve have been confirmed as heatstroke, while medical examiners are still investigating four.

38: Since 1998, the annual average of juvenile deaths in cars has been 38, the Department of Earth and Climate Science found. There were 44 deaths last year, compared to 34 in 2012.

600: Since 1998, there have been more than 600 juvenile deaths triggered by hyperthermia, or heat stroke, and the spread of cases has varied by year.

61 percent: The NHTSA estimates heatstroke is the cause of 61 percent of non-crash-fatalities in children under 14.

68 percent: While the majority of heatstroke deaths in cars occurs between June and August, deaths have been recorded for every month besides January over the past 16 years, according to researchers at San Francisco State University. Over that span, there were a total of 15 deaths in March and 19 in October.

54 percent: More than half of those who left children alone in vehicles did so unknowingly, according to Kidsandcars.org. Other reasons cited: the child got into the vehicle on his or her own (32 percent), child was knowingly left in vehicle (12 percent) and circumstance unknown (2 percent).